my_str="万过薪月，员序程马黑来，nohtyp学"
result1=my_str[9:4:-1]
print(f"{result1}")

#倒序字符串，切片取出
result2=my_str[::-1][9:14]
print(f"{result2}")

#切片取出，然后倒序
result3=my_str[5:10][::-1]
print(f"{result3}")

#split分割“，”，replace替换“来”为空，倒序字符串
result4=my_str.split("，")[1].replace("来","")[::-1]
print(f"{result4}")